Fully dense powder metallurgy (PM) Ti–4Fe–0.2O–3Cu–0.4Si alloy was produced employing spark plasma sintering (SPS) and hot extrusion aiming to develop an inexpensive high strength dual-phase (α+β) Ti alloy. The microstructure consisted of globularized fine grain α phase dispersed in the β matrix having the sharp texture of <10$\overline{1}$0>//extrusion direction. The tensile strength of alloy (∼1060 MPa) is comparatively higher than the conventional Ti–6Al–4V alloy produced by a similar method. Based on theoretical calculations the grain refinement and solid solution phenomena were the principal strengthening mechanisms. Additionally, it was found that Si solute remarkably enhanced the microstructure stability (using in situ EBSD observation) and yield strength of alloy at high-temperature.

采用火花等离子体烧结（SPS）和热挤压工艺生产了全致密粉末冶金（PM）Ti–4Fe–0.2O–3Cu–0.4Si合金，目的是开发一种廉价的高强度双相（α+β）Ti合金。微观结构由散布在β基体中的球形细颗粒α相组成，其α<10$\overline{\mathrm{1个}}$0> //挤压方向。合金的抗拉强度（〜1060 MPa）相对高于通过类似方法生产的常规Ti-6Al-4V合金。根据理论计算，晶粒细化和固溶现象是主要的强化机理。另外，发现Si溶质显着提高了合金在高温下的微观结构稳定性（使用原位EBSD观察）和屈服强度。